Industry standard for drawing involute splines

[SplineD]

Hi friends, Can anyone tell me how do I draw spline tooth profile
having modified tooth thickness (maximum actual).

I have a LSP program but it draws the teeth with basic space width.

I need to use this profile for checking broached components on a profile projector.


Thank you in advance.

 

[dinjin]

Simply reverse the addendum and dedendum values
and enter the tooth thickness instead of the
tooth space.

 

[SplineD]

Thanks dinjin.

But my problem with the current LSP prog, is that I dont have the privelege of modifying the basic tooth thickness.

I want to draw an actual spline profile, comprising of the space width tolerances.

Do the ANSI b92.1 or DIN 5480, specify how to draw the involute splines. If not then what is the method, industry follows to draw involute spline profiles.

P.S. I am a beginner, and whatever comments you have is thankfully welcomed.

 

[WinstonH]

Hi friends, Can anyone tell me how do I draw spline tooth profile
having modified tooth thickness (maximum actual).

I have a LSP program but it draws the teeth with basic space width.

I need to use this profile for checking broached components on a profile projector.

But my problem with the current LSP prog, is that I dont have the privelege of modifying the basic tooth thickness.

I want to draw an actual spline profile, comprising of the space width tolerances.

Do the ANSI b92.1 or DIN 5480, specify how to draw the involute splines. If not then what is the method, industry follows to draw involute spline profiles.

P.S. I am a beginner, and whatever comments you have is thankfully welcomed.

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Hi,Splines realy should be checked with gages. If the form needs to be checked, should use an involute inspection machine & chart it, BUT Then there's the real world when sometimes one needs to do the unconventional to get some Idea of whats what.

So, Long long ago, etc, what I did was calculate points on the involute profile using actual tooth or tooth space dimensions MULTIPLIED BY THE MAGNIFICATION OF THE PROJECTOR, 3 points on a drawing is visually ok, 5 gives an adequate profile, 7 a very good profile. Either spline thru them or if one had a querky Cadd program, 3 point arcs thru 1,2,3, then 3,4,5,the 5,6,7,mirror to give a full tooth or space, radial copy to get the whole gear/spline. I used to add an "x" and y" line at the edge of the drawing to verify print scaling, part number etc,adjust as required, print out on transparency material.

attached a link to an excel spreadsheet.
Cheers,